Conversion of CO₂ to fuels via gas phase catalysis or high-value products via heterogeneous organic synthesis or biocatalysis will be crucial to reduce industrial carbon footprints. In all cases, suitable carriers are required for high catalytic performance. A versatile approach is presented combining freeze-casting with polymer-derived ceramics, showcased for various CO₂ utilization technologies. In a first example, microreactors for CO₂ methanation are developed: By depositing 25wt.% Ni on dendritically structured SiOC, CO₂ conversions up to 58% can be reached at 400°C, demonstrating the material’s suitability at elevated temperatures. The second example involves SiOC-supported ionic liquids for selective production of limonene carbonate by cycloaddition of supercritical CO₂ to bio-based epoxides, where SiOC outperforms silica-60. Tunable water affinity of SiOC by interrupting the pyrolysis promotes catalytic performance. In a third example, freeze-cast SiOC is evaluated for supporting biosynthetic processes. The macropores are accessible for microorganisms like K. phaffii to form biofilms, providing a promising starting point aiming for heterogeneous whole cell catalysis. Results on freeze-cast SiOCs for a variety of CO₂ conversion processes demonstrate that linking in-depth knowledge on chemistry, structuring and conversion of preceramic polymers can create a versatile materials platform for CO₂ utilization.